DIPTEEA. 263 



DIACHLORUS (p. 57), 

 Diachlorus ferrugatus (p. 57). 



To the localities given, add : — Mexico, Teapa in Tabasco (H. H. Smith). 



DICHELACERA (p. 58). 

 Dichelacera cervicornis (p. 58). 



To the localities given, add : — Mexico, Navarete in Tepic, Santiago Iscuintla in 

 Jalisco (Schumann), Acapulco and Rio Papagaio in Guerrero (H. H. Smith). 



Four specimens. Were it not for the observations made by Osten Sacken I should 

 have felt little hesitation in treating these insects as a new species, so poorly do they 

 agree with Wiedemann's and Schiner's descriptions. In one example, the smallest, 

 the brown of the outer part of the wings is partly dissolved into spots. In all the 

 others the wings are dark brown, with the following light yellowish-hyaline markings : 

 a triangular spot in the marginal cell, the basal half of the first submarginal cell, the 

 basal third or less of the first posterior cell, the basal two-thirds of the discal cell, the 

 proximal end of the fourth and fifth posterior cells, and the whole of the second basal 

 cell. In the first-mentioned specimen, the middle legs are wholly yellow, the distal 

 joints, only, of the tarsi being somewhat infuscated ; in the others the tip of the tibiae 

 and the tarsi are dark brown. In all of them, the front and hind tibiae and tarsi are 

 dark brown or black, the basal portion of the tibiae more or less yellow. The present 

 species is evidently not D. januarii, to judge from the large size of the frontal 

 callosity. 



2. Dichelacera pulchra, sp. n. (Tab. IV. figg. 22, 22 a, $ .) 



c? . Eyes with an area of enlarged facets above, which are clearly distinguished from the small ones below 

 Frontal triangle and the sides of the face opaque light yellow ; convex portion of the face for the most 

 part shining, pitchy-black. Antennse rather longer than the head ; yellow, the annulate portion of the 

 third joint black, the distal part of the non-annulate portion brownish ; the upper projection is acute, 

 and extends a little beyond the base of the annulate portion. Proboscis black, the labella enlarged ; in 

 length a little less than the vertical diameter of the head. Palpi black; third joint curved upward, 

 somewhat swollen at the tip and clothed with black hair. Mesonotum black, moderately shining, with 

 black hair ; in front with the beginning of a broad cinereous stripe ; a triangular spot at the outer ends 

 of the suture, and a narrow band in front of the scutellum, covered with bright golden-yellow pile. 

 Pleura? black, with black pile ; lightly cinereous-pollinose below. Scutellum somewhat reddish on the 

 margin. Abdomen black or pitchy-black ; posterior part of the first segment yellow, as is also the narrow 

 hind margin of the next two or three segments ; pile black. All the femora black, with the exception of 

 the immediate tip, which is yellowish ; all the tibiae light yellow, with the exception of the distal half 

 of the front pair, which is dark brown ; front tarsi brown, the four posterior tarsi brownish distally. 

 "Wings with a broad dark brown band, the inner margin of which extends obliquely from near the end 

 of the first vein to the fifth posterior cell near its proximal third (the band leaves the outer margin of 

 the wing and the largest part of the fifth posterior cell nearly hyaline) ; a similar dark brown colour fills 

 out the outer half of the anal cell ; costal, subcostal, and the proximal part of the marginal cells brownish- 

 yellow ; the large triangular space behind this front-border is yellowish-hyaline. 



